MIPS: BCM63xx: Utilize asm/bmips-spaces.h

Since BCM63xx runs on BMIPS3300 which requires the use of a FIXADDR_TOP
to avoid collisions with the SBR, utilize asm/bmips-spaces.h which
defines FIXADDR_TOP for us now.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: blogic@openwrt.org
Cc: cernekee@chromium.org
Cc: jogo@openwrt.org
Patchwork: https://patchwork.linux-mips.org/patch/9969/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/mach-bcm63xx/spaces.h

@@ -10,7 +10,7 @@
 #ifndef _ASM_BCM63XX_SPACES_H
 #define _ASM_BCM63XX_SPACES_H
 
-#define FIXADDR_TOP		((unsigned long)(long)(int)0xff000000)
+#include <asm/bmips-spaces.h>
 
 #include <asm/mach-generic/spaces.h>